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MANCHESTER, ENGLAND - JUNE 29: A woman protects her self from the sun in Piccadilly Gardens on June 29, 2009 in Manchester, England. Forecasters have predicted a heatwave across England and Wales with temperatures rising as high as 32C (90F). NHS staff have been put on standby to treat patients suffering from the heat. (Photo by Christopher Furlong/Getty Images)

credit: Christopher Furlong/Getty Images

WASHINGTON (CBSDC) — Blistering heat will again blanket the Washington region with temperatures expected to soar above the 100-degree mark on Friday and Saturday, before yielding to just below the triple-digit mark on Sunday and Monday.

The National Weather Service has issued a heat advisory for the region beginning at 11 a.m. Friday.

Authorities are reminding citizens that there is an increased risk of heat exhaustion and other heat-related illness for those spending excessive amounts of time outdoors and those without air-conditioning.